The Duci is a two-inch knife with a ring on the end, which tells you almost everything about who it is for. It is a 1.97-inch CPM-20CV flipper in a titanium frame lock, 54 grams, $199, designed by Ostap Hel, with a removable titanium ring and a release button built into it.
The measurements: 6.38 inches overall including the ring, 1.97-inch blade at 0.13 inch stock, 61-62 HRC, closed length 4.41 inches, titanium handle and clip, ceramic bearings, steel pivot and hardware. There are four finishes: black PVD and bead blasted at $199, black stonewash at $199, and flamed titanium at $238. The ring is bead blasted on the black model and matches the handle on the others.
Two-inch blades are a specialized tool. They are legal in more places, they fit in a coin pocket, and they are useless for anything that needs reach. What makes the Duci work is the ring: it turns a tiny knife into a full-hand grip, which is the difference between a two-inch blade you can actually cut with and one you have to pinch. Making the ring removable is the right call, because some people want the grip and some people want the pocketability.
CPM-20CV at 61-62 HRC in a two-inch blade is overkill in the best sense: the edge will outlast the task, and the steel is stainless enough to live in a pocket without care. Compared with the Duoz at $69.90, the Duci costs nearly three times as much for a blade two-thirds the length, so this is not a value proposition. It is a small-knife specialist's knife.
Verdict: buy it if you want a $199 two-inch blade with a real grip and a supersteel that will not need sharpening, or if you live somewhere with a two-inch limit. Skip it if you want one knife that can do everything, because a 1.97-inch blade cannot and the ring does not change that.